<template>
  <form action="/">
    <van-search
        v-model="searchText"
        show-action
        placeholder="请输入要搜索的标签"
        @search="onSearch"
        @cancel="onCancel"
    />
  </form>
  <van-divider content-position="left">已选标签</van-divider>
  <div v-if="activeIds.length===0">请选择标签</div>
  <van-row gutter="16" style="padding: 0 16px">
    <van-col v-for="tag in activeIds">
      <van-tag closeable size="small" type="primary" @close="doClose(tag)">
        {{ tag }}
      </van-tag>
    </van-col>
  </van-row>
  <van-divider content-position="left">选择标签</van-divider>
  <van-tree-select
      v-model:active-id="activeIds"
      v-model:main-active-index="activeIndex"
      :items="tagList"
  />
  <div style="padding: 16px">
    <van-button block type="primary" @click="doSearchResult">搜索</van-button>
  </div>
</template>

<script setup>
import {ref} from 'vue';
const searchText = ref('');
import {useRouter} from "vue-router";

const router=useRouter();

/**
 * 执行搜索
 */
const doSearchResult=()=>{
  router.push({
    path: '/user/list',
    query: {
      tags: activeIds.value
    }
  })
}

const onSearch = (val) => {
  tagList.value = originTagList.map(parentTag =>{
    const tmpChildren =  [...parentTag.children];
    const tmpParentTag =  {...parentTag};
    tmpParentTag.children = tmpChildren.filter(item => item.text.includes(searchText.value))
    return tmpParentTag;
  })
};
// 取消，清空
const onCancel = () => {
  searchText.value = '';
  tagList.value=originTagList;
};

// 已选中的标签
const activeIds = ref([]);
const activeIndex = ref(0);

const originTagList=[
  {
    text: '性别',
    children: [
      {text: '男', id: '男'},
      {text: '女', id: '女'},
    ],
  },
  {
    text: '年级',
    children: [
      {text: '大一', id: '大一'},
      {text: '大二', id: '大二'},
      {text: '大三', id: '大三'},
      {text: '大四', id: '大四'},
      {text: '研一', id: '研一'},
      {text: '研二', id: '研二'},
    ],
  },
]
// 标签列表
let tagList = ref(originTagList);

// 移除标签
const doClose = (tag) => {
  activeIds.value = activeIds.value.filter(item => {
    return item !== tag;
  })
}

</script>

<style scoped>

</style>